Vanadium Wire Springs: Wire springs are 48 mm in diameter and come sewn in to individual calico pockets. As a finishing touch, the innerspring support system is hand formed into a honeycomb-nested unit. British Fleece / Horsehair Blended Upholstery: Regal Superb comes upholstered with bonded British fleece cotton, then topped with horsehair blended with British fleece wool. This layer is enclosed with a hair-proof cambric cover. Next, the Regal Superb is overlaid with a layer of Shetland Isle fleece wool and cotton for added comfort. Mattress Border: The border of the Regal Superb is 23 cm deep and reinforced with 3 rows of hand stitching on all sides. Each side of the Regal Superb has air vents to promote air circulation and ideal temperature regulation. Borders are upholstered in protective wool as a finishing touch, featuring piped ticking for added softness. A Cover of Your Choice: The Regal Superb is available in any of the finest-quality Belgian ticking from the Vi-Spring collection. For more information, please contact a sales representative.